Zobrazeno 1 - 10
of 18
pro vyhledávání: '"John E Steffen"'
Autor:
John E Steffen
Publikováno v:
Revista de Biología Tropical, Vol 57, Iss 3, Pp 859-864 (2009)
Predation has been hypothesized to be a strong selective force structuring communities of tropical lizards. Comparisons of perch height and size-based predation frequencies can provide a unique window into understanding how predation might shape habi
Externí odkaz:
https://doaj.org/article/0c21955cea1f4d2e96265cf20f740829
Autor:
John D Peterson, John E Steffen, Laura K Reinert, Paul A Cobine, Arthur Appel, Louise Rollins-Smith, Mary T Mendonça
Publikováno v:
PLoS ONE, Vol 8, Iss 4, p e62146 (2013)
Chytridiomycosis, a disease caused by Batrachochytrium dendrobatidis, has contributed to worldwide amphibian population declines; however, the pathogenesis of this disease is still somewhat unclear. Previous studies suggest that infection disrupts cu
Externí odkaz:
https://doaj.org/article/c0723fe084be49f89147b2bc20c51285
Publikováno v:
Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology. 253:110546
Carotenoid-colored integuments commonly function as sexually selected honest signals because carotenoid pigments can be costly to obtain, ingest, absorb, metabolize or transport before being deposited into the integument. As such, carotenoid pigmenta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3691ded8d13f1c53c269578806b83255
https://doi.org/10.1016/j.cbpb.2020.110546
https://doi.org/10.1016/j.cbpb.2020.110546
Publikováno v:
Comparative biochemistry and physiology. Part B, Biochemistrymolecular biology. 229
Determination of how carotenoid-based color patches change with pigmentary access is important to understanding color patch function in animals. We performed a carotenoid addition experiment on male painted turtles (Chrysemys picta) to determine if a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::baf466fbc92d7c59e8d37e9dfcd36319
https://pubmed.ncbi.nlm.nih.gov/30557612
https://pubmed.ncbi.nlm.nih.gov/30557612
Publikováno v:
Chelonian Conservation and Biology. 14:56-63
The objective quantification of integumentary color and its pigmentary basis have been relatively little studied in turtles. We used reflectance spectrometry to measure the color of the chin, neck, and leg stripes and spots of the painted turtle (Chr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91bfb93c315a4929aebf1bd78dbec5b4
https://doi.org/10.2744/ccab-14-01-56-63.1
https://doi.org/10.2744/ccab-14-01-56-63.1
Autor:
John E. Steffen, Craig Guyer
Publikováno v:
Biological Journal of the Linnean Society. 111:646-655
Many animals display visual signals in male contests for access to females and territories. These visual signals can be multimodal and stimulate different aspects of a signal receiver’s visual system. Over two summers, we tested whether aspects of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6faaebcd07f34cc7dc882e0a31056847
https://doi.org/10.1111/bij.12229
https://doi.org/10.1111/bij.12229
Autor:
Adrián Gutiérrez, Dennis Denis, John E. Steffen, Humberto J. Morris, Yasel U. Alfonso, Lourdes Rodríguez-Schettino
Publikováno v:
Copeia. 2013:201-205
Dewlap coloration of anoles is diverse and both carotenoid and pterin pigments play a role in generating this color variation. In the present study, we examined the carotenoid and pterin concentrations responsible for generating color variability in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7da8be0c03bff25c60bc8a8fb425a1e0
https://doi.org/10.1643/cp-12-071
https://doi.org/10.1643/cp-12-071
Publikováno v:
Copeia. 2010:239-246
Carotenoids are integumentary colorants that must be ingested by vertebrates to be used as colorants. In many studies of fish and birds, carotenoid color serves as an indicator of foraging success, nutritional state, or parasite load. The dewlap of m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::abf6ede74597f9eca861f04cdaca16b0
https://doi.org/10.1643/cp-09-067
https://doi.org/10.1643/cp-09-067
Autor:
John E. Steffen
Publikováno v:
South American Journal of Herpetology. 4:245-252
Allometry for sexual size dimorphism (SSD) occurs when the degree of SSD varies with overall body size and is common in animals, including lizards. Previous reviews of allometry for SSD showed ‘Iguanid’ lizards to be comprised of mostly malelarge
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c806b2d45d3fa1fae896ea91032be00
https://doi.org/10.2994/057.004.0307
https://doi.org/10.2994/057.004.0307
Autor:
Kevin J. McGraw, John E. Steffen
Publikováno v:
Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology. 154:334-340
Sexually selected colors in animals can be created by multiple pigments (e.g., carotenoids, melanins, pterins), but how these pigment classes interact to generate intraspecific color variation has rarely been tested, especially in reptiles. We examin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::04820064b5408b200dcfd5a6d98cdb8f
https://doi.org/10.1016/j.cbpb.2009.07.009
https://doi.org/10.1016/j.cbpb.2009.07.009